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https://issues.apache.org/jira/browse/KAFKA-5174?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16001059#comment-16001059
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ASF GitHub Bot commented on KAFKA-5174:
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Github user asfgit closed the pull request at:
https://github.com/apache/kafka/pull/2982
> RocksDb might stall in environments with 1 core only
> ----------------------------------------------------
>
> Key: KAFKA-5174
> URL: https://issues.apache.org/jira/browse/KAFKA-5174
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 0.10.2.1
> Reporter: Eno Thereska
> Assignee: Eno Thereska
> Fix For: 0.11.0.0
>
>
> - there is a regression in 0.10.2.1 that impacts RocksDb's behaviour (details
> below for first impact) from this PR:
> https://github.com/apache/kafka/commit/f9660e16dafb9e1109704bdecb978b7046f0cc6b#diff-046ca566243518c88e007b7499ec9f51
> - worst-case impact: streams might not run out-of-box in deployments with 1
> core only
> - workaround: no new jars needed for the workaround, only a config change
> that changes a RocksDb parameter, e.g. something like in this PR:
> https://github.com/confluentinc/examples/pull/117/files
> - full fix: add 1 to the current config (i.e., max cpus + 1) in the default
> settings
> The RocksDb code might have a bug itself, since when running with one core
> it both sets the number of compaction threads to 1
> (https://github.com/facebook/rocksdb/blob/5.0.fb/util/options.cc#L762) AND
> the maximum number of compactions variable to 0
> (https://github.com/facebook/rocksdb/blob/5.0.fb/util/options.cc#L760) which
> doesn't make much sense. I've sent a message in RocksDb channel.
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